Are you connected to the web? Haha, seriously though, are you?
Assuming you have the appropriate login e-mail and password (and also you're linked to the web) there's a couple of points that may be triggering your troubles:
Facebook Can't Log In
Are you getting an error message? If so, check the Facebook help page for descriptions and fixes to recognized concerns.
See to it you do not have any kind of extensions or antivirus programs running that are blocking Facebook.
Have you tried removing the application's cache? Most likely to Settings > Applications > Facebook > Clear Cache. If this doesn't work you can attempt clearing information as well and as a last hope uninstalling and also re-installing the app totally.
Did you sign up with your phone number? Make certain you enter the country code also when visiting.
If the app is telling you to upgrade your email address, this is most likely due to the fact that your email server is identifying your Facebook e-mails as spam.
If you have actually just recently registered for Facebook you may need to verify your account initially. If you have actually recently transformed your password, make certain you're trying to visit with the brand-new password and not the old one.
If you're visiting via a browser, see to it you have cookies allowed which facebook.com is contributed to your checklist of secure websites.
Make sure you have the most recent variation of the Facebook app for Android.
